GHSA-WPQR-JCPX-745R
Vulnerability from github – Published: 2022-07-05 21:06 – Updated: 2022-08-05 13:56
VLAI?
Summary
Incorrect handling of invalid surrogate pair characters
Details
Impact
What kind of vulnerability is it? Who is impacted?
Anyone parsing JSON from an untrusted source is vulnerable.
JSON strings that contain escaped surrogate characters not part of a proper surrogate pair were decoded incorrectly. Besides corrupting strings, this allowed for potential key confusion and value overwriting in dictionaries.
Examples:
# An unpaired high surrogate character is ignored.
>>> ujson.loads(r'"\uD800"')
''
>>> ujson.loads(r'"\uD800hello"')
'hello'
# An unpaired low surrogate character is preserved.
>>> ujson.loads(r'"\uDC00"')
'\udc00'
# A pair of surrogates with additional non surrogate characters pair up in spite of being invalid.
>>> ujson.loads(r'"\uD800foo bar\uDC00"')
'foo bar𐀀'
Patches
Has the problem been patched? What versions should users upgrade to?
Users should upgrade to UltraJSON 5.4.0.
From version 5.4.0, UltraJSON decodes lone surrogates in the same way as the standard library's json module does, preserving them in the parsed output:
>>> ujson.loads(r'"\uD800"')
'\ud800'
>>> ujson.loads(r'"\uD800hello"')
'\ud800hello'
>>> ujson.loads(r'"\uDC00"')
'\udc00'
>>> ujson.loads(r'"\uD800foo bar\uDC00"')
'\ud800foo bar\udc00'
Workarounds
Is there a way for users to fix or remediate the vulnerability without upgrading?
Short of switching to an entirely different JSON library, there are no safe alternatives to upgrading.
For more information
If you have any questions or comments about this advisory: * Open an issue in UltraJSON
Severity ?
7.5 (High)
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "ujson"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.4.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2022-31116"
],
"database_specific": {
"cwe_ids": [
"CWE-670"
],
"github_reviewed": true,
"github_reviewed_at": "2022-07-05T21:06:00Z",
"nvd_published_at": "2022-07-05T18:15:00Z",
"severity": "HIGH"
},
"details": "### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nAnyone parsing JSON from an untrusted source is vulnerable.\n\nJSON strings that contain escaped surrogate characters not part of a proper surrogate pair were decoded incorrectly. Besides corrupting strings, this allowed for potential key confusion and value overwriting in dictionaries.\n\nExamples:\n\n```python\n# An unpaired high surrogate character is ignored.\n\u003e\u003e\u003e ujson.loads(r\u0027\"\\uD800\"\u0027)\n\u0027\u0027\n\u003e\u003e\u003e ujson.loads(r\u0027\"\\uD800hello\"\u0027)\n\u0027hello\u0027\n\n# An unpaired low surrogate character is preserved.\n\u003e\u003e\u003e ujson.loads(r\u0027\"\\uDC00\"\u0027)\n\u0027\\udc00\u0027\n\n# A pair of surrogates with additional non surrogate characters pair up in spite of being invalid.\n\u003e\u003e\u003e ujson.loads(r\u0027\"\\uD800foo bar\\uDC00\"\u0027)\n\u0027foo bar\ud800\udc00\u0027\n```\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nUsers should upgrade to UltraJSON 5.4.0.\n\nFrom version 5.4.0, UltraJSON decodes lone surrogates in the same way as the standard library\u0027s `json` module does, preserving them in the parsed output:\n\n```python3\n\u003e\u003e\u003e ujson.loads(r\u0027\"\\uD800\"\u0027)\n\u0027\\ud800\u0027\n\u003e\u003e\u003e ujson.loads(r\u0027\"\\uD800hello\"\u0027)\n\u0027\\ud800hello\u0027\n\u003e\u003e\u003e ujson.loads(r\u0027\"\\uDC00\"\u0027)\n\u0027\\udc00\u0027\n\u003e\u003e\u003e ujson.loads(r\u0027\"\\uD800foo bar\\uDC00\"\u0027)\n\u0027\\ud800foo bar\\udc00\u0027\n```\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nShort of switching to an entirely different JSON library, there are no safe alternatives to upgrading.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [UltraJSON](http://github.com/ultrajson/ultrajson/issues)\n",
"id": "GHSA-wpqr-jcpx-745r",
"modified": "2022-08-05T13:56:18Z",
"published": "2022-07-05T21:06:00Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/ultrajson/ultrajson/security/advisories/GHSA-wpqr-jcpx-745r"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-31116"
},
{
"type": "WEB",
"url": "https://github.com/ultrajson/ultrajson/commit/67ec07183342589d602e0fcf7bb1ff3e19272687"
},
{
"type": "PACKAGE",
"url": "https://github.com/ultrajson/ultrajson"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NAU5N4A7EUK2AMUCOLYDD5ARXAJYZBD2"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OPPU5FZP3LCTXYORFH7NHUMYA5X66IA7"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Incorrect handling of invalid surrogate pair characters"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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